Installation guide for hazardous areas
The concept of intrinsic safety in wiring recognizes that a sufficient concentration of ignitable, flammable or combustible materials will be present, with air or another oxidizer, to represent a fire or explosion hazard. These mixtures could easily be ignited by a match or other open flame, or by a high-energy spark. The wiring used in areas where these mixtures are present can be implemented in a manner which absolutely precludes any possibility of igniting these mixtures. That is the essence of intrinsic safety. Intrinsically safe wiring will never have enough energy available within the defined hazardous area to ignite any explosive or combustible mixture of gasses, dusts, or metals.
Where it is impossible to reduce the electrical circuit energy (as with electric motor power) the circuits must be physically isolated from the hazardous atmosphere, dust or metals. This is the principle behind explosion-proof wiring. Even if the circuit did ignite a quantity of hazardous mixture, the wiring container, can “contain” the resulting explosion and cool any escaping hot gasses so that they would be incapable of igniting the hazardous mixture outside of the explosion-proof container.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2019/07/28 |
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523 KB |
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